User Manual
Greasehead
145-2884-HV0
OPS-2884 Rev E
4
effect on the pressure drop created as so this is the most important parameter
to consider.
Figure 4: Couettes flow equation
The actual diameter of the wire must be measured and recorded to allow the
correct diameter of flow tube to be selected. The condition of the wire must
also be considered as mud or rust ingress can cause the wire to swell.
Consideration also needs to be given to the wear of the flow tubes as these
tend to wear in the middle, where it is most difficult to measure the bore.
The grease is injected above the first flow tube and exits after the last one.
Since the grease is continuously moving and some is being lost to the well,
the injection process is continuous and in order to create sufficient flow rate it
may be necessary to inject at two locations depending on the well pressure.
The table below shows the recommended greasehead arrangement
depending on the well pressures. This is a guideline only.
Well Pressure
Fluid
No of flow tubes*
No of Injection Points
0-5000 psi
Liquid
4
1
0-5000 psi
Gas
5
1
5-10,000 psi
Liquid
6
1
5-10,000 psi
Gas
7-8
1
10-15,000 psi
Liquid
10
2
10-15,000 psi
Gas
11-12
2
* including the flow tubes below the grease injection port(s)